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Binder-free lignite forming system and forming technology

A molding process, lignite technology, applied in the field of binderless lignite molding system and molding technology, can solve the problems of lignite briquette reabsorption and difficult drying process, achieve high drying efficiency, improve waterproof performance, and good economic benefits Effect

Active Publication Date: 2016-03-30
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes still have problems such as difficult control of the drying process and serious reabsorption of lignite briquettes.

Method used

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  • Binder-free lignite forming system and forming technology
  • Binder-free lignite forming system and forming technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 A kind of binderless lignite molding system

[0029] This embodiment provides a binderless lignite molding system, including a pretreatment device 1, a drying device 2, a dust removal device 3, a condensation device 4, a water purification device 5, a water-proof solution tank 6, a molding device 7, and a briquette bunker 8;

[0030] Wherein, the outlet of the pretreatment device is connected to the raw material inlet of the drying device, the dry coal outlet of the drying device is connected to the material inlet of the molding device, the gas outlet of the drying device is connected to the gas inlet of the dust removal device, and the gas outlet of the dust removal device is The outlet is connected to the gas inlet of the condensing device, the liquid outlet of the condensing device is connected to the water purification device, the water outlet of the water purification device is connected to the inlet of the waterproof solution tank, the outlet of the w...

Embodiment 2

[0034] Embodiment 2 A kind of molding process for preparing lignite briquettes

[0035] This embodiment provides a molding process for preparing lignite briquettes by using the system described in the above embodiment 1, comprising the following steps:

[0036] 1) Inner Mongolia lignite with a moisture content of 32% is sent to the crushing and screening device 1 for crushing and screening to obtain lignite pulverized coal with a particle size of <2 mm.

[0037] 2) The lignite pulverized coal is sent to the fluidized bed drying device 2 for low-temperature drying, and the low-temperature flue gas is sent in from the bottom of the fluidized bed at 160°C. Lignite pulverized coal is dried in a fluidized bed drying unit to a certain degree of moisture content of 12%.

[0038] 3) Lignite pulverized coal at a temperature of 80° C. is fed into the molding device 7 . The flue gas and water vapor discharged from the top of the fluidized bed drying device 2 enter the dust removal devi...

Embodiment 3

[0041] Embodiment 3 A kind of molding process for preparing lignite briquettes

[0042] This embodiment provides a molding process for preparing lignite briquettes by using the system described in the above embodiment 1, comprising the following steps:

[0043] 1) Indonesian lignite with a moisture content of 40% is sent to the crushing and screening machine 1 for crushing and screening to obtain lignite pulverized coal with a particle size of <2 mm.

[0044] 2) The lignite pulverized coal is sent to the fluidized bed drying device 2 for low-temperature drying, and the low-temperature flue gas is sent from the bottom of the fluidized bed at 180°C. Lignite pulverized coal is dried in a fluidized bed drying unit to a certain degree of moisture content of 14%.

[0045] 3) Lignite pulverized coal with a temperature of 70° C. is fed into the molding device 7 . The flue gas and water vapor discharged from the top of the fluidized bed drying device 2 enter the dust removal device 3...

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Abstract

The invention relates to a binder-free lignite forming system and forming technology. The forming system comprises a pretreatment device, a drying device, a dedusting device, a condensing device, a water purification device, a waterproof solution tank, a forming device and a briquette coal bin; lignite is crushed and screened through the pretreatment device firstly, low-temperature flue gas drying is conducted on the crushed and screened lignite through a fluidized bed, and the dried lignite is sent into the lignite forming device for high pressure forming; a mixture of flue gas and water vapor produced by the drying device is dedusted through the dedusting device and condensed, one part of obtained condensed water is mixed with a briquette coal waterproof agent to be prepared into briquette coal waterproof liquid which is used for coating the surface of briquette coal in a sprayed mode when the briquette coal is formed. By combining a lignite low-temperature flue gas drying technology and a lignite binder-free high-pressure forming technology with a briquette coal surface coating technology, moisture of the lignite is effectively reduced, drying water is recycled, the lignite calorific value is increased, the briquette coal is more suitable for long distance transport, and the application value of the lignite is improved.

Description

technical field [0001] The invention relates to a binder-free lignite forming system and a forming process, belonging to the technical field of energy. Background technique [0002] my country's lignite resources are relatively rich, and the proven reserves of resources have reached 130 billion tons, accounting for about 13% of the country's reserves. Compared with bituminous coal and anthracite, lignite has low price and high reactivity, but it belongs to low-rank coal, which is characterized by high moisture content, easy weathering and spontaneous combustion, and low calorific value. At present, drying molding technology is an important means and direction for lignite upgrading and utilization. The capillary pores in lignite are developed, and the ability of reabsorbing water after drying is very strong. The briquettes are affected by the weather during transportation or open-air storage. Water absorption is serious. In the case of high humidity, the moisture absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/08C10L5/04
Inventor 孙宝林裴培刘周恩吴道洪
Owner SHENWU TECH GRP CO LTD